Pyroxylin composition



Patented Mar, 8 1 932 i ROBERT CALVERT, or'wILi'IErTnfILLInoIs; ASSIGNOR- TO VAN scIIAAoK BROS. CHEM;-

indicates the presence of twice as many ether .'gr'oups ashydroXyI.

' shown that a rather concentrated solution of pyroXylin in this solvent will show gelling I with less tuluol than required in a parallel er su GA won-Ks,- 1\Io-.,*0F oHIoAGo} ILLINOIS, A oonr'onarrou or ILLINOIS frYRox'YL N No Drawing. l Application filed. November I My invention relates .to a newz usefulpyroxylin composition comprising an hydroXyl-acetfl. r r

It -h'as been known that a mixture of alcohol and ether is a solvent for certain grades of initrocellulose; v The. solvent powers of such. a mixture are considered by some chemlsts as due possibly to an oxomum compound" of the type 7 1 'CHJI' H There are instances-where the proportion of an alcohol to an etherwhich could enter into such an OXOIHUm COlnPOllIlCl'lS approxlmately thatproportionwhich 'gives a mix ture of maximum solvent power for pyrox-' ylilL. f I

If the presence ofone hydroxyl group for each ether group is importantinedetermining the solvent power, then the monoe thyl ether of ethylene glycol, CI-I OHCH OQGJTL should he an excellent solvent for pyroxy'lin, that is, should withstand a high degreeoii dilution by such anon-solvent as toluol. Suchvisthe case.

In many lacquers present'a high boiling solventthat .is not too rapid or active as asolvent forpyroXylin.

In brush-lacquer, for example, it is important that thelaequer-being brushed ,overan earlier coat should not dissolve, soften, or pick up"? the earl ercoat to an excessive extent.

v V I have discovered thatj'the hydroxy-acetals provide. high boiling solvents that are not as active solvents as butyl acetate or ethylene glycol monoethyl-ether, forexample. I Aldol dimethyl acetahan example of the hydroxy-acetals, is more: or'less' typical. Its 'formula, r

ogom; f

test'in which either loutyl-acetate of. glycol monoethyl ether is sulostitutedlforv the 'aldol dimethyl acetal. V This inventionisnot limited it is desiralole to have By test, it has been 10, 927, Serial m5. 232,45

to any theoryof theexplanation of'thisdifliquid boiling at 73- Cfa't a 'pressureofapr "proximately 13 mm. of mercury, is addedto pyro ylinuntil the-latter dissolves. Or, the

acetal is used 'inassociation with othermaterials to give the mixtures represented by the I following formulas. 'All parts are bylweight.

Pg rowyli n lacquer. jFormuZa #15 Formula it! lowing formulas g Lacquers containing the so -called soluble pyroXylin areillustrated by theifolf r of acid.

Many variations be made without departing from the spirit of my invention. Thus I may use other hydroxy-acetals, as for example, the diethyl acetal. of glycollic aldehyde, CH .OH.GH(OC H boiling at .8 mm. at 57S (l, or aldol diethyl acetal, CH CHOHCH CH(66 1-1 Another hydroXy-ether in which there are more ether than alcohol groups, and which I may use in conjunction with pyroxylin, is ethylidene ethyl hydroXy-ethyl ether,

CCzHs CH3.CH

0 CH2.CIT2OH..

Another is the diether of glycerine, CH OHCHOC H CH OC2H I may use other gums than ester, as, for eX- ample, dammar, and other plasticizers than dibutyl phthalate, as, for example, diamyl phthalate. The proportions of ingredients may be varied widely. Thus, the prop ortion of hydroXy-acetal to dibutyl phthalate may be decreased or increased to produce difierent drying conditions in the lacquer film. Other volatile solvents or diluents may be used, as, for example, benzol, amyl acetate, ethyl lac.- tate, or ethyl butyl acetal. Different concentrations of pyroxylin may be used in the lacquer. While I have used to advantage pyroXylin of so-called half-second viscosity that contains about 12% of nitrogen, pyroxylin' of other viscosities may be used.

In the presence of free acid, especially of a mineral acid such as nitric or nitrous which may develop in a pyroxylin composition, an acetal may decompose slowly to give an aldehyde and an alcohol. For this reason, I may add to the solution containing the acetal and V pyr'oxylin some material to prevent the .ac-

cumulation of an undesirable concentration Such a material I call a stabilizer.

Examples of stabilizers which I may use are zinc acetate, urea, zinc oxide, and white lead.

I claim:

1. A composition of. matter comprising pyroxylin and an hydroxy-acetal.

2. A composition of matter comprising pyroxylin, an hydroXy-acetal and a resin.

3. A composition of matter comprising pyroxylin, an hydrOXy- -acetal, a resin, and a plasticizer.

4:. A composition of matter comprising pyroxylin, an hydroXy-acetal, a resin, and dibutyl phthalate.

5. A composition of matter comprising pyroxylin and aldol dimethyl acetal.

6. A composition of matter comprising pyroxylin, aldol dimethyl acetal, and a resin.

7. A composition of matter comprising pyroxylin, aldol dimethyl acetal, a resin, and a plasticizer.

8. A composition of matter comprising pyroxylin, aldol dimethyl acetal, a resin, and dibutyl phthal ate'. l

9. A composition of matter comprising pyroxylin, aldol dimethyl acetal, .and butyl alcohol. r

10. A composition of matter comprising 10 parts by weight of pyroxylin and 4 parts of aldol dimethyl acetal. V

11. A lacquer comprising pyroxylin, aldol dimethyl acetal, a resin, and a substantially non-volatile ester.

12. A lacquer comprising pyroxylin, aldol dimethyl acetal, a resin, and a substantially non-volatile ester in amount equal to at least one-third the weight of the aldol dimethyl acetal.

18. A lacquer comprising pyroxylin, aldol dimethyl acetal, a resin, and a substantially non-volatile ester in amount substantially equal to the weight of the aldol dimethyl acetal.

14:. A lacquer comprising pyroX'ylin, aldol dimethyl acetal, a resin, and dibutyl phthalate in amount equal to at least one-third the weight of the aldol dimethyl acetal.

15. A lacquer comprising pyroxylin, aldol dimethyl acetal, a resin, and dibutyl phthalate in amount substantially equal to the weight of the aldol dimethyl acetal.

16. A composition ofmatter suitable for use as a lacquer, said composition containing alcohol-soluble.pyroxylin and an hydroxya acetal.

17. A composltion of matter suitable for use as a lacquer, said composition containing alcohol-soluble pyroxylin and aldol dimethyl acetal,

18. A composition of matter comprising pyroxylin, aldol dimethyl acetal, and a stabilizer. v v I .19. A composition of matter comprising pyroxylin,an hydroXy acetal, and a pigment capable of reactingwith nitric'acid to give a salt.

, ROBERT CALVERT. 

